feat: add snjs package

packages/snjs/lib/Services/Session/Sessions/TokenSession.ts

@@ -0,0 +1,46 @@
+import { SessionBody, SessionRenewalResponse } from '@standardnotes/responses'
+import { Session } from './Session'
+
+/** For protocol versions >= 004 */
+export class TokenSession extends Session {
+  static FromApiResponse(response: SessionRenewalResponse) {
+    const body = response.data.session as SessionBody
+    const accessToken: string = body.access_token
+    const refreshToken: string = body.refresh_token
+    const accessExpiration: number = body.access_expiration
+    const refreshExpiration: number = body.refresh_expiration
+    const readonlyAccess: boolean = body.readonly_access
+
+    return new TokenSession(accessToken, accessExpiration, refreshToken, refreshExpiration, readonlyAccess)
+  }
+
+  constructor(
+    public accessToken: string,
+    public accessExpiration: number,
+    public refreshToken: string,
+    public refreshExpiration: number,
+    private readonlyAccess: boolean,
+  ) {
+    super()
+  }
+
+  isReadOnly() {
+    return this.readonlyAccess
+  }
+
+  private getExpireAt() {
+    return this.accessExpiration || 0
+  }
+
+  public get authorizationValue() {
+    return this.accessToken
+  }
+
+  public canExpire() {
+    return true
+  }
+
+  public isExpired() {
+    return this.getExpireAt() < Date.now()
+  }
+}